perf evlist: No need to setup affinities when enabling events for pid targets

When the target is a pid, not started by 'perf stat' we need to enable
the events, and in that case there is no need to setup affinities as we
use a dummy CPU map, with just one entry set to -1.

So stop doing it to avoid this needless call to sched_getaffinity():

  # strace -ke sched_getaffinity perf stat -e cycles -p 241957 sleep 1
  <SNIP>
  sched_getaffinity(0, 512, [0, 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20, 21, 22, 23, 24, 25, 26, 27, 28, 29, 30, 31]) = 8
   > /usr/lib64/libc-2.33.so(sched_getaffinity@@GLIBC_2.3.4+0x1a) [0xe6eea]
   > /var/home/acme/bin/perf(affinity__setup+0x6a) [0x5329ca]
   > /var/home/acme/bin/perf(__evlist__enable.constprop.0+0x23) [0x4b9693]
   > /var/home/acme/bin/perf(enable_counters+0x14d) [0x42de5d]
   > /var/home/acme/bin/perf(cmd_stat+0x2358) [0x4310c8]
   > /var/home/acme/bin/perf(run_builtin+0x6a) [0x4a2cfa]
   > /var/home/acme/bin/perf(main+0x612) [0x40f8c2]
   > /usr/lib64/libc-2.33.so(__libc_start_main+0xd4) [0x27b74]
   > /var/home/acme/bin/perf(_start+0x2d) [0x40fadd]
  <SNIP>

Acked-by: Ian Rogers <irogers@google.com>
Cc: Adrian Hunter <adrian.hunter@intel.com>
Cc: Andi Kleen <andi@firstfloor.org>
Cc: Ian Rogers <irogers@google.com>
Cc: Jiri Olsa <jolsa@kernel.org>
Cc: Namhyung Kim <namhyung@kernel.org>
Link: https://lore.kernel.org/r/20220117160931.1191712-4-acme@kernel.org
Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>

diff --git a/tools/perf/util/evlist.c b/tools/perf/util/evlist.c
index 6e88d404b5b3e96fece7d56b1efd0a90dd166c1e..ae6d4363da76ec566e7a5f56e602096dfdb85e1e 100644 (file)
--- a/tools/perf/util/evlist.c
+++ b/tools/perf/util/evlist.c
@@ -487,12 +487,16 @@ static void __evlist__enable(struct evlist *evlist, char *evsel_name)
 {
        struct evsel *pos;
        struct evlist_cpu_iterator evlist_cpu_itr;
-       struct affinity affinity;
+       struct affinity saved_affinity, *affinity = NULL;
 
-       if (affinity__setup(&affinity) < 0)
-               return;
+       // See explanation in evlist__close()
+       if (!cpu_map__is_dummy(evlist->core.cpus)) {
+               if (affinity__setup(&saved_affinity) < 0)
+                       return;
+               affinity = &saved_affinity;
+       }
 
-       evlist__for_each_cpu(evlist_cpu_itr, evlist, &affinity) {
+       evlist__for_each_cpu(evlist_cpu_itr, evlist, affinity) {
                pos = evlist_cpu_itr.evsel;
                if (evsel__strcmp(pos, evsel_name))
                        continue;
@@ -500,7 +504,7 @@ static void __evlist__enable(struct evlist *evlist, char *evsel_name)
                        continue;
                evsel__enable_cpu(pos, evlist_cpu_itr.cpu_map_idx);
        }
-       affinity__cleanup(&affinity);
+       affinity__cleanup(affinity);
        evlist__for_each_entry(evlist, pos) {
                if (evsel__strcmp(pos, evsel_name))
                        continue;